Pulverized-fuel burner



Apri 9, 1929, 3 CLENbQN H,7@$,496

PULVERIZED FUEL BURNER Filed June 12, 1925' /& INVENTOR BY AM ATTORNEYS moaneeareu'r oFFic GEORGE W. CLENDON, PIERMONT, NEW YORK, ASSIGNOB TO COMBUSTION ENGI- 7 NEERIN G CORPORATION, A CORPORATION OF NEW YORK.

'PULVERIZED-FUEL BURNER.

Application filed June 12, 1925. Serial No. 36,573.

This invention relates to means for burning pulverized fuel and it is especially useful in the burning of-such fuel under stationary boilers.

()he of the primary objects of the burner is togive a complete and rapid mixture of fuel and air, thereby affording complete combustion with a short, hot flame, the advantage of which is, among other thlngs,

lothata small setting may be employed.

Another object of the invention is to provide 'a burner construction in which coking of the-fuel at the burner is minimized, if not completely eliminated.

Another object of the invention is to provide a burner which may be regulated to give any desired flame within reasonable limitations.

More specificallyconsidered, the invention consists in the combination and arrangement of parts herein set forth.

How the foregoing, together: with such other objects as may hereinafter appear, or are incident to my invention, are realized, is illustrated in the accompanying drawing,

which is a sectional view of one form of burner embodying my improvements.

Referring now to the drawing, the reference character A denotes the combustion 30 chamber, having one or more openings 7, thru the wall thereof. Over this opening is secured the burner indicated as a whole by the reference letter B. This burner comprises a casting 8, preferably circular in ....i cross section, terminating in the bell 9, which constitutes the discharge end thereof. The inner end of the memberS is flanged for coupling to the powdered fuel supply line 10 and is also provided with a. regulating means such as the damper 11. Within the tubular member 8 is a second cone or bell 12, the two members cooperating to provide [an annular channel 13. The inner bell terminates short of the outer bell and the space between the bells at the discharge end of the inner bell is more restricted than elsewhere. Air'under control of the damper 14 is supplied to the inner bell from the air conduit 15 and the extension l5 -thereof, which latter constitutes a part of the burner. The inner .or discharge end of the extension 15 is formed into a somewhat circular chamber 15 which surrounds the bell 9, the wall 15 thereof being arranged so as to deflect the air supply thru the extension 15 ,in the manner indicated by the arrows. 'The air supplied to the annular chamber 15 is under the control of the damper 16.

The operation is as follows: Preferably from 10 to 15% of thea'ir for combustion is utilized to carrythe fuel thru the pipe 10 to the burner, the fuel discharging between the two bells in a hollow frustoconical stream. Into this streanr additional air is introduced thru the bell 12, and still additional air is supplied to the exterior of the stream of fuel thru the chamber 15 this latter air being directed angularly with respect to the cone. The air entering thru the inner bell helps to cool the burner and helps Thus, detrimental coking at cone with the fuel in the cone, the violenceof the mixture being dependent upon the pressure of the air and relative supplies. By proper manipulation of the burners a violent mixture may be set up to produce a quick, short, hot flame or the flame may be lengthened out or softened. One or two burners may sufiice for a chamber.

What I claim is:

1. A pulverized fuel burner comprising in combination, inner and outer coaxiallv mounted bells forming an annular fuel inlet passage therebetween, said 'bells being configured and proportioned to discharge the fuel from said passage in a frusto-conical sheet diverging from the burner, means for admitting air thru said inner bell and means for admitting air from around the outer bell into the fuel stream in a frusto-conical sheet converging toward said stream.

2. A pulverized fuel burner comprising in combination, inner and outer coaxially mounted bells forming an annular fuel in let passage therebetween, said bells'being configured -and proportioned to discharge the fuel from said passage in a frusto-conical sheet diverging from the burner, means for admitting air thru said inner bell and a casing surrounding the bells adapted to discharge a frusto-conical sheet of air converging toward the fuel stream.

In testimony whereof, I have hereunto signed my name.

GEORGE W. CLENDON. 

